\subsection{Audio Domains} %temp title - something better, maybe? - Gustav 4 April
When looking at sound signals, there are various ways to visualize the signal. Depending on what is in focus, one can look at the signal from different perspectives, also known as a domain. There are two primary domain types, as illustrated in figure \ref{fig:time_vs_freq}.

\begin{figure}[htbp]
\centering
\includegraphics[width=0.8\textwidth]{images/TheoryDesign/time_vs_freq_domain}
\caption{Comparing a 1 kHz in time and frequency domain. Note the difference in the X axis \cite{timeFreqDomain}.}
\label{fig:time_vs_freq}
\end{figure}

\subsubsection{Time Domain}
As the name suggest, the time domain looks at the signal in relation to time. The horizontal axis represent the time that the wave traverses in. The time-domain graph shows how the signal changes over a period of time. This can be useful when one wants to see how the frequencies change over time. It is easy to count the number of times the wave repeats and thereby finding the frequency, as well as the period.

\subsubsection{Frequency Domain}
Another way to look at a signal is by using the frequency domain. Here the focus in the frequencies, not time, which is why the horizontal axis shows Hz instead of seconds. A graph in the frequency domain describes how much of the signal that lies in each given frequency band in a range of frequencies.